"Be promiscuous" is a phrase that typically refers to engaging in multiple sexual partners without commitment. It could be considered offensive or derogatory in certain contexts, which is why it's important to consider alternative synonyms. Some of the most common synonyms for "be promiscuous" include being easy, slutty, loose, or sexually active. Other more nuanced terms might include being sexually liberated, non-monogamous, or polyamorous. However, it's essential to use these synonyms with care and sensitivity, as every individual has their own unique preferences and lifestyle choices around their sexuality. Therefore, it's important to respect each person's choices and preferences without judgment or stigma.